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Posted to general@xerces.apache.org by Sharad Singh <si...@gmail.com> on 2006/08/16 11:26:31 UTC
help with extending saxparser todefine some addtional rules
Hi,
I am using the SAXParser provided in the xerces.jar through which i am able
to validate xml based on dtd validations. Now I need to extend the Saxparser
functionality so that i can define some additional rules and perform
validations on that rules. Can anyone please tell me how can i do that?
for EXAMPLE i would like to validate expression : a+(b+c)
on following grammar that the brackets are properly closed and the operator
+ must have two operands....
I will have the expression written in the xml as
<mytag> a+(b+c) </mytag>
thanks in advance...
--
Thanks/Regards
Sharad Kumar Singh
Re: help with extending saxparser todefine some addtional rules
Posted by Scott Hinkelman <sr...@us.ibm.com>.
Sharad, Stanimir,
Needing to check additional constraints on information beyond what a given
constraint mechanism can accomplish 'out of the box' is a common problem.
While programmatic unique extensions to a given constraint mechanism may be
an option, many times it is something undesirable and the user would rather
accomplish it in a declarative way. Something that may be of interest
here, which allows using several constraint mechanisms:
http://www-128.ibm.com/developerworks/xml/library/x-bics20/
thanks,
Scott
------------
Scott R. Hinkelman, Senior Software Engineer
IBM Software Group / Emerging Technologies
Cross-Industry SOA Foundation Standards Strategy
Office: 512.823.8097 (TL 793.8097)
Cell: 512.415.8490
Stanimir
Stamenkov
<stanio@myrealbox To
.com> j-users@xerces.apache.org
cc
08/17/2006 08:20
AM Subject
Re: help with extending saxparser
todefine some addtional rules
Please respond to
j-users@xerces.ap
ache.org
/Sharad Singh/:
> I am using the SAXParser provided in the xerces.jar through which i am
> able to validate xml based on dtd validations. Now I need to extend the
> Saxparser functionality so that i can define some additional rules and
> perform validations on that rules. Can anyone please tell me how can i
> do that?
>
> for EXAMPLE i would like to validate expression : a+(b+c)
> on following grammar that the brackets are properly closed and the
> operator + must have two operands....
> I will have the expression written in the xml as
> <mytag> a+(b+c) </mytag>
So you have already written an |org.xml.sax.ContentHandler|
implementation to read the element text content? Then you process it
in whatever fashion you need and you could throw a
|org.xml.sax.SAXException| (you may make a subtype you handle
specifically) from your handler to terminate the parsing if
something is not valid - all handler methods are declared to throw
|org.xml.sax.SAXException|. That content validation of course is
specific to your application and is not something you could get out
of the box using standard XML validation.
--
Stanimir
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Re: help with extending saxparser todefine some addtional rules
Posted by Stanimir Stamenkov <st...@myrealbox.com>.
/Sharad Singh/:
> I am using the SAXParser provided in the xerces.jar through which i am
> able to validate xml based on dtd validations. Now I need to extend the
> Saxparser functionality so that i can define some additional rules and
> perform validations on that rules. Can anyone please tell me how can i
> do that?
>
> for EXAMPLE i would like to validate expression : a+(b+c)
> on following grammar that the brackets are properly closed and the
> operator + must have two operands....
> I will have the expression written in the xml as
> <mytag> a+(b+c) </mytag>
So you have already written an |org.xml.sax.ContentHandler|
implementation to read the element text content? Then you process it
in whatever fashion you need and you could throw a
|org.xml.sax.SAXException| (you may make a subtype you handle
specifically) from your handler to terminate the parsing if
something is not valid - all handler methods are declared to throw
|org.xml.sax.SAXException|. That content validation of course is
specific to your application and is not something you could get out
of the box using standard XML validation.
--
Stanimir
---------------------------------------------------------------------
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